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Pact Tooling MCP server

by Pact-Community-Organization·io.github.Pact-Community-Organization/pact·v0.2.2
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Pact 5 tooling: REPL test runs, trap scanning, gas estimation, interface diff, format checks.

A91/100grade A
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Safety scan
A91/100

full report

Adoption
Growing

0 stars33 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Pact Tooling tools (6, 2 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • pact.fmt_check

    Read-only formatting check for .pact/.repl files. Detects trailing whitespace, tabs, excess blank lines, missing newline, CRLF. Never writes.

  • pact.gas_estimate

    Parse gas probes emitted by a .repl file (Gas: / env-gas) and return per-probe measurements. Does NOT inject probes.

  • pact.interface_diff

    Compare before/after .pact files and report added/removed/changed/unchanged symbols with a breakingChange flag.

  • pact.module_scan

    Static-analyze a .pact file for the 5 critical Pact 5 traps (non-binary +, try DML, enforce DB read, builtin shadow, bare pact-id).

  • pact.repl_runwrite action

    Execute a single .repl file via the pact binary and parse Load/expect/gas output. Local-only.

  • pact.repl_run_manywrite action

    Sequentially execute a batch of .repl files and return per-file + aggregate results. Optional fail-fast. Local-only.

Public scan report

scanner v0.1.9 · 2026-09-26 · same rubric, same numbers if you re-run it

no findings
  • Code scan25 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 22 days ago15/15
  • Maintainer identityregistry namespace matches repository owner7/10
Overall 91/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Pact Tooling compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
91/100
higher than 85% of 48,255 servers
Tools
6
the typical server has 7
Tools that change things
33%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
33
more than 22% of 12,191 servers with a package

What its tools let an agent do: 4 read · 2 change

Install Pact Tooling in Claude Code, Cursor or VS Code

Runs npx -y @pact-community/mcp-pact on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add pact -- npx -y @pact-community/mcp-pact
Add to Cursor

What the publisher says

From the Pact Tooling repository's README, as published. We do not edit it. Read it on GitHub

pact-mcp — MCP servers for Pact & Chainweb

Model Context Protocol servers that give your AI agent safe, auditable access to the Pact 5 development loop on Kadena Chainweb.

Run REPL tests, scan modules for critical language traps, estimate gas, and query or submit to Chainweb nodes — from Claude, Cursor, VS Code, or any MCP-compatible client. Every tool runs behind a strict, tested security baseline, and no tool ever touches a private key.

{
  "mcpServers": {
    "pact": {
      "command": "npx",
      "args": ["-y", "@pact-community/mcp-pact"],
      "env": { "PACT_COMMUNITY_WORKSPACE_ROOT": "/path/to/your/project" }
    }
  }
}

Servers

Both are listed in the official MCP registry as io.github.Pact-Community-Organization/pact and io.github.Pact-Community-Organization/chainweb.

Install

VS Code (one click)

Using VS Code with GitHub Copilot? Install with a single click:

The button opens VS Code and pre-fills the configuration. You can also search the MCP Servers view, or add from the command line:

code --add-mcp '{"name":"pact","command":"npx","args":["-y","@pact-community/mcp-pact"],"env":{"PACT_COMMUNITY_WORKSPACE_ROOT":"${workspaceFolder}","PACT_COMMUNITY_PACT_BIN":"pact"}}'

On VS Code Insiders, use vscode-insiders: in the links or code-insiders on

the command line.

Claude Code

claude mcp add pact -e PACT_COMMUNITY_WORKSPACE_ROOT=/path/to/your/project \
  -- npx -y @pact-community/mcp-pact

Any MCP client

Add both servers to your client configuration:

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Pact Tooling: common questions

Is Pact Tooling MCP server safe?
Yes, by our scan: it is graded A (91/100). Read the Pact Tooling safety report
How do I install Pact Tooling?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Pact Tooling need an API key?
No secret keys are declared. It reads 2 settings from the environment.
Is Pact Tooling maintained?
The last commit was 61 days ago (2026-09-04). The latest release is v0.2.2.
What can I use instead of Pact Tooling?
Servers from other publishers that do the same job: Qase Test Management MCP server.
How does Pact Tooling compare with other MCP servers?
safety score 91/100 (higher than 85% of 48,255 servers); tools 6 (the typical server has 7); tools that change things 33% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Pact Tooling

Same job from other publishers: the closest match first, then the best rated.

  • Qase Test Management
    Official MCP server for Qase — manage test cases, runs, suites, defects via AI tools.
    A